luster of jade
璘 centers on the glossy, reflective quality of polished jade: its luster or shimmering surface.
璘 combines 王 (jade) with 粦, which likely contributes the sound リン and may suggest a shimmering or phosphorescent quality, giving the meaning 'luster of jade'.
The left side 王 is jade, and the right side 粦 looks like a mix of evening 夕 and rice 米 with legs 舛, as if polished rice grains are dancing in the evening light. Picture a jade ornament catching the light and shimmering like that.
For リン, imagine a jade ring gleaming with luster: ring -> リン, and the polished jade shines like a precious ring.